perf_counter: per event wakeups

By request, provide a way to request a wakeup every 'n' events instead
of every page of output.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Orig-LKML-Reference: <20090402091319.323309784@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 06a6fba9f531..5428ba120d78 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -145,7 +145,7 @@ struct perf_counter_hw_event {
                                 __reserved_1   : 53;
 
         __u32                   extra_config_len;
-        __u32                   __reserved_4;
+        __u32                   wakeup_events;  /* wakeup every n events */
 
         __u64                   __reserved_2;
         __u64                   __reserved_3;
@@ -321,6 +321,7 @@ struct perf_mmap_data {
         int                             nr_pages;
         atomic_t                        wakeup;
         atomic_t                        head;
+        atomic_t                        events;
         struct perf_counter_mmap_page   *user_page;
         void                            *data_pages[0];
 };